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Plane Geometry
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Demonstrations 1  20 of 1016
Making the Three Areas Defined by Congruent Overlapping Circles Equal
New this month
Japanese Theorem for Cyclic Polygons
New this month
On Which Side of a Directed Line Is a Point?
Brianchon's Theorem
Angle of Intersection of Two Circles
Multiple Reflections in Two Mirrors
The Pedal and Antipedal Triangles
Exact Trilinear Coordinates
Orthologic Triangles
The Geometry of the Steiner Tree Problem for up to Five Points
Constructing a Steiner Tree for Five Points
Circle Inversion of Basic Figures
Cumulative Area under a Cycloid versus the Area of Its Rolling Circle
G^1 Hermite Interpolation with PythagoreanHodograph Cubic Curves
Constructing the Radius of a Ball
Gardner's Problem
Five Circles Theorem
Bézier Curve Approximation of an Arc
TwistHinged Dissection of a Hexagram to Two Hexagons
Da Vinci's Construction of an Ellipse
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